<slideshow> must be used. It's a simple tiled gallery that used in many Wordpress websites and there could be 30+ images. In this case, it would hurt to read articles with this template.
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Reference screenshot: https://telegra.ph/file/9c3db97ad23bc2e28ed4e.png
Reference rules:
https://instantview.telegram.org/checklist#6-2-3-galleries-and-slideshows